ETC Request ID: STIS.ta.1005940

Exposure time (seconds) = 2.0000

gives: SNR = 182.2689

gives: Time to Saturation (for a single exposure) = 12.54 seconds


Plots

Detailed Information Count rate Total counts Associated noise
(e-/s) (e-) (e-)
Counts (box of 3 x 3 pixels)
    Source 16,908.389 33,816.78 183.89
    Background 0.163 0.33 0.57
        Sky 0.001 2.10e-03 0.05
        Dark Current 0.162 0.32 0.57
    Read Out 24.60
Total in selected region 16,908.552 33,817.10 185.53
Brightest Pixel (single exposure) 9,569.004 19,138.01
Global Count Rates
    Source only 33,816.778 67,633.557
    Background (sky+dark) 18,941.131 37,882.26
Background per unit area
    Sky Background (arcsec-2) 0.047 0.093
    Dark Current (arcsec-2) 7.200 14.400
Extraction region
box of 3 x 3 pixels
    Effective Sky Area (pixels) 9.00
    Fraction of flux 0.50
    Fraction of flux in brightest pixel 0.28
Effective Wavelength 3741.45 Å

Instrument name: STIS
Mode: Target Acquisition
Detector: CCD
Acquisition Mode: ACQ
Aperture: F28X50OII
Gain: 4.0
# Frames: 1
Binning: 1
Dark: medium


Target: [point source]
Spectrum: Castelli-Kurucz Models A5V 8250 4.0
Extinction E(B-V): None
Normalization: Renormalized to vegamag = 8.14 in filter Johnson/V
Redshift: None
Emission Lines: None


Selected background:
  Sky Background:
    Level:

Plots

These results were computed using: ETC version 25.2